Hi, new Civ player here. I made a couple triremes in my current game in preparation for the tech that allows making caravels. I've read on numerous sites that you can upgrade triremes into caravels, but even after I attained the ability to create caravels in cities, my triremes show no option when I click on them to upgrade like my warriors did when I upgraded them. Is there something I'm missing? Thanks!
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